by Ramón Rubio Silvestre, Enrique Rubio Polo · Rubio · tapa blanda · ISBN 9788489773233
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«Problemes Rubio 18» is the problem workbook by Ramón Rubio Silvestre and Enrique Rubio Polo, published by Rubio in paperback (20 pages, in Catalan).
Activity workbook presenting problems of addition, subtraction, multiplication and division with multi-digit numbers, with progressive exercises to practice logical-mathematical reasoning. Designed as elementary school reinforcement material, it is part of the Operacions i Problemes RUBIO series in Catalan.
Workbook number 18 of the series «Operacions i Problemes RUBIO (català)», within the collection «l'Art d'apprendre». Published by Rubio in 2010.
For students aged 11 to 12, in 6th grade of elementary school, as mathematics reinforcement material.
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